January in Yalova is the cloudiest and the coldest month of the year. In January, the weather in Yalova is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Yalova has 13 rainy, 9 partly cloudy, 5 cloudy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Yalova.